Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R. You are currently viewing as a NON-REGISTERED guest which gives you limited access to view discussions

To gain full access to our forums you must register; for a free account. As a registered Guest you will be able to:

Participate in over 40 different forums and search/browse from nearly 3 million posts.

There are still many of these in the Houston / Pasadena area still running and making product. Unfortunately I can't take any pic's as that's the quickest way to get thrown out of the plants. The biggest one I've worked on was 2 Carrier 2 wheeler that had a mile of piping to several evaporators at different temps and 105,000#s of R-12, converted to 115,000#s of R-134a. Getting all the oil out was fun as every low point had to be drilled and drained. The evaporator temps ranged from -40 (cascade style) to 50*F. The recovery unit was an open drive 80 ton compressor / condenser. We had to remove all the charge twice in 5 years, used semi-trailers to hold the charge.-GEO

Having sex is like playing cards, if you don't have a good partner, you better have a good hand. !!!!!!

There are still many of these in the Houston / Pasadena area still running and making product. Unfortunately I can't take any pic's as that's the quickest way to get thrown out of the plants. The biggest one I've worked on was 2 Carrier 2 wheeler that had a mile of piping to several evaporators at different temps and 105,000#s of R-12, converted to 115,000#s of R-134a. Getting all the oil out was fun as every low point had to be drilled and drained. The evaporator temps ranged from -40 (cascade style) to 50*F. The recovery unit was an open drive 80 ton compressor / condenser. We had to remove all the charge twice in 5 years, used semi-trailers to hold the charge.-GEO

Funny you should mention oil, one of our main issues with this system is oil loss through the demister. We have it apart to go through it with a fine tooth comb but I am curious if anyone has seen any alterations to the bearing housing vent line to remove the oil more efficiently than the copper wool they pack in the top of the bearing inspection cover. I've been wondering about using a coalescing separator in the vent line with a return pipe back to the sump. We can physically watch as about 3 drops of oil a minute are lost to the system and the flooded evap has no eductor setup to return oil. Both units on this site have the same problem and oil logging in the evaporator is not helping the efficiency at all. Last year I removed 980 lbs of oil that was trapped in the accumulator.

nyrb- With all the refrigerant lines running in all kinds of directions the basic job was to prevent the oil from leaving the high pressure side of the system and getting into all the different evaporators and heat exchangers. So once the conversion was started a discharge oil separator was fitted in line coming off the compressor outlet. All the low points were also fitted with ball valves with sight glasses above. Some oil still gets through, but each heat exchanger has a vertical gauge glass and multi-level taps. The production crew has the responsibility to check levels every 12 hour shift. All the valves lead directly to the high velocity side of the accumulator so the oil ends up were it belongs. Had several calls due to production people leaving valves open. It was working fine the last time I was there. They did have to change both condensers because of tube condition and poor water treatment. -GEO

Having sex is like playing cards, if you don't have a good partner, you better have a good hand. !!!!!!